Redirect a subdomain/domain to a service running on a local port.

rdr-subdomain

#!/bin/bash

if [ "$#" -ne 2 ]
then
  echo "Add a subdomain redirection to nginx."
  echo "Usage: <subdomain> <port>"
  exit 1
fi

echo "Redirecting the subdomain '$1' to local port '$2'."
read -r -p "Are you sure? [y/N] " response
response=${response,,}
if [[ $response =~ ^(yes|y)$ ]]
then
  touch /etc/nginx/sites-available/$1
  echo "# Redirect $1 to the local port $2" > /etc/nginx/sites-available/$1
  echo "" >> /etc/nginx/sites-available/$1
  echo "server {" >> /etc/nginx/sites-available/$1
  echo "  listen 80;" >> /etc/nginx/sites-available/$1
  echo "  server_name $1;" >> /etc/nginx/sites-available/$1
  echo "  " >> /etc/nginx/sites-available/$1
  echo "  location / {" >> /etc/nginx/sites-available/$1
  echo "    proxy_pass http://127.0.0.1:$2/;" >> /etc/nginx/sites-available/$1
  echo "    proxy_set_header   X-Real-IP        \$remote_addr;" >> /etc/nginx/sites-available/$1
  echo "    proxy_set_header   X-Forwarded-For  \$proxy_add_x_forwarded_for;" >> /etc/nginx/sites-available/$1
  echo "    proxy_set_header   Host             \$host;" >> /etc/nginx/sites-available/$1
  echo "    proxy_redirect     off;" >> /etc/nginx/sites-available/$1
  echo "  }" >> /etc/nginx/sites-available/$1
  echo "}" >> /etc/nginx/sites-available/$1

  cd /etc/nginx/sites-enabled
  ln -s /etc/nginx/sites-available/$1 $1 2>/dev/null; true
  service nginx reload
fi